There is a possibility that the user name and password that you are using is not used for the wireless connection of the network. If you have WPA enabled on your router, you need a password with a minimum number of 8 characters. If you enabled WEP on the router, it may need 10 or 26 characters depending on what type of encryption is enabled on the router.
You can check that using the Web interface of the router. Try these steps:
1. Connect a computer to the router wired then restart the computer.
2. Launch an internet browser and type in
http://192.168.0.1 or if you changed the IP, use the changed address.
3. If it asks for a user name and password, set admin as the user name and password as the router password. If you have changed the password, use the new password.
4. Click on the wireless and check the security type. Make sure that the Mac filter is disabled and there you can find the network key set on your computer.
5. You can then use that key to connect your wireless computer
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